The population of compact radio sources in M 17
| Autor: | Vanessa Yanza, Josep M. Masqué, Sergio A. Dzib, Luis F. Rodríguez, S.-N. X. Medina, Stan Kurtz, Laurent Loinard, Miguel A. Trinidad, Karl M. Menten, Carlos A. Rodríguez-Rico |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics::Solar and Stellar Astrophysics Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics |
| Popis: | We present a catalog of radio sources of the M 17 region based on deep X band radio observations centered at 10 GHz obtained with the Jansky Very Large Array in the A configuration. We detect a total of 194 radio sources, 12 of them extended and 182 compact. We find that a significant fraction (at least 40% in our catalog) have suspected gyrosynchrotron emission associated with stellar coronal emission. By comparing the radio luminosities of our sources with their X ray counterparts, when available, we find that they are underluminous in X rays with respect to the G\"udel Benz relation, but a correlation with a similar slope is obtained provided that only sources with evident non thermal nature are selected from the sample compiled for the Orion Nebula Cluster (ONC) and M 17. The comparison of M 17 with the ONC and NGC 6334D-F leads to a similar luminosity function for the three regions, at least for the more luminous sources. However, the radio sources in M 17 are three times more numerous compared to the other regions at a given luminosity and their spatial distribution differs from that of Orion. Moreover, an arc-shaped structure of 40$"$ in extent is observed in our map, identified previously as an ionizing front, with the cometary Hyper Compact source UC1 at its focus. Archival 1 mm ALMA data reveals compact emission coincident with the radio wavelength peak, possibly associated with a protostellar disk of the massive star exciting UC1. Comment: 25 pages, 8 tables, 8 figures, accepted for publication in The Astronomical Journal |
| Databáze: | OpenAIRE |
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